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How Poor Sleep Makes You Sick | Dr. Max Krummel & Dr. Andrew Huberman

Huberman Lab Clips04:46Added Aug 31, 2026

Dr. Matthew (Max) Krummel on Dr. Andrew Huberman discuss how sleep deprivation impacts immune function and lymphatic clearance, highlighting the mechanisms o...

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Contributed by 刘嘉琪

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  1. Sleep & Immune Function

  2. 00:00Why is it at a mechanistic level that if
  3. 00:02you miss a night or two of sleep that
  4. 00:05your immune system seems so less
  5. 00:07effective in fighting off off
  6. 00:08infections? Do we know what's happening?
  7. 00:10Is it like you've got so much adenosine
  8. 00:12which is the sleepy molecule and and uh
  9. 00:14like that that adenosine inhibits te-
  10. 00:17cell function or something? Do we
  11. 00:18actually know? Because I think all of us
  12. 00:20are familiar with the fact that if we we
  13. 00:21don't sleep well or enough for a couple
  14. 00:23of nights, we're much more susceptible
  15. 00:25to getting sick. Yeah.
  16. 00:26Is there a mechanistic understanding of
  17. 00:28why that's so? I think there are bits
  18. 00:30and pieces of it. I think um some some
  19. 00:33really nice work shows that at night a
  20. 00:35few wacky thing when you're sleep a few
  21. 00:38what you might have thought would be
  22. 00:39wacky things happen and and one of them
  23. 00:40is that a lot of your immune cells clear
  24. 00:43back to the bone marrow
  25. 00:45um and and your tissues become populated
  26. 00:47with a bunch of neutrfils that come out
  27. 00:50of the bone marrow and and seem to be
  28. 00:52you know depositing collagen around your
  29. 00:54body and and so there's a lot of things
  30. 00:56that I think are reparative about sleep.

  31. Why We Need Sleep

  32. 00:58I've thought about this a lot in my own
  33. 01:00life as probably you have with sleep is
  34. 01:01to one of the questions of course is why
  35. 01:03do we bother to have sleep and and I
  36. 01:05guess I can only imagine this because
  37. 01:07our you know we've created these these
  38. 01:09bodies of ours are so capable and
  39. 01:11they're so energetically and you know
  40. 01:13you know um consumptive and they make
  41. 01:15all these byproducts during the day that
  42. 01:17that at some point you just need a
  43. 01:19cleanup phase and that's that's one
  44. 01:20interpretation of sleep you just need to
  45. 01:22reset so the immune system is definitely
  46. 01:24resetting and and you know there's as I
  47. 01:26said there's evidence that a lot of the
  48. 01:27cells go kind quiescent into the tissues
  49. 01:29and they they may leave you alone for
  50. 01:31those reparative processes and actually
  51. 01:33allow those.
  52. 01:34You know, in terms of the data on there,
  53. 01:36there's there's a lot of studies that
  54. 01:38are being done and and I can't say that
  55. 01:40I've come to a a conclusion about that.
  56. 01:42This is this comes in the question of
  57. 01:44like is it known or do I do I not know
  58. 01:46it or is it does nobody know it? And I'd
  59. 01:49say this is might be one of these areas
  60. 01:50where about 10 factions of people know
  61. 01:52it but they don't agree,
  62. 01:54you know. So there's variations on
  63. 01:56things, but I think the data, for
  64. 01:57example, that immune cells dive into the
  65. 01:59bone marrow at night is is pretty solid.
  66. 02:01That makes sense.
  67. 02:02What they're doing and why that's
  68. 02:03important in the long sense of like what
  69. 02:05you're talking about everything from
  70. 02:06well, but I think it's, you know, things
  71. 02:08that happen overnight, you you're
  72. 02:10definitely your cognition improves. Is
  73. 02:12that immune or is that neuronal or both?

  74. Lymphatic Clearance & Physical Appearance

  75. 02:14I think it's both.
  76. 02:15Something in the lymph plumbing immune
  77. 02:17system. One thing that's just striking
  78. 02:19like that is undeniable is probably the
  79. 02:22best way to put it is um everybody has
  80. 02:24bags under their eyes and looks like
  81. 02:25when they are sleepd deprived. They
  82. 02:27sleep for a night or two
  83. 02:29and it
  84. 02:30goes away. That's clearly accumulation
  85. 02:33of lymph. We we actually know that.
  86. 02:35That's just lymph fluid that's not being
  87. 02:36cleared. And it might not even be the
  88. 02:37brain's uh lymphatic clearance system.
  89. 02:40It's just there's a bunch of lymph
  90. 02:41pooling under your eyes. That's why you
  91. 02:43look like
  92. 02:44Yeah. And then you sleep for two nights
  93. 02:46well and you look better again. And the
  94. 02:49eyes get glassy. We know that the eyes
  95. 02:51get glassy when we're sleepd deprived.
  96. 02:53That's also a a lymphatic clearance
  97. 02:55issue. This is well established. Like so
  98. 02:57there's some things that are just like
  99. 02:58plumbing works better when we sleep and
  100. 03:00get up again. There's something
  101. 03:01literally about lying down and getting
  102. 03:02up. But that to me can't explain the the
  103. 03:06immune thing entirely because like the
  104. 03:10lymphatic system is like among other
  105. 03:12things, you know, immune surveillance.
  106. 03:15But
  107. 03:16I mean, one night lousy sleep and the
  108. 03:19person coughing across the room gets you
  109. 03:21sick
  110. 03:22often.
  111. 03:23But when you're well rested, you
  112. 03:24actually feel this robustness like n
  113. 03:27like okay, I might wash my hands or just
  114. 03:28kind of avoid them and you're good.
  115. 03:30Yeah. So it's it's I mean it's an
  116. 03:32incredible effect one way or the other.

  117. Car Windshield Analogy

  118. 03:34Again I don't know the degree to which
  119. 03:36we can nail down you know which which
  120. 03:39part of things that are happening is
  121. 03:40which. I always like the story that that
  122. 03:42the um there's macrofasages immune cells
  123. 03:44in your eye that are basically clearing
  124. 03:46the clearing the lens. Mhm.
  125. 03:48You know, so there's there's all these
  126. 03:49like places where it's doing little
  127. 03:52clean up that you can imagine that if
  128. 03:54the the thing it's trying to get rid of
  129. 03:56is granularity that that you need to
  130. 03:58have sleep where you just aren't making
  131. 03:59more granularity so that it can you know
  132. 04:02sort of like when you wash your car
  133. 04:03windshield you do it completely at that
  134. 04:05point and but you can't be driving with
  135. 04:07flies hitting you right.
  136. 04:10That's a great analogy
  137. 04:11you know. So, I think there's certain
  138. 04:12elements of some of these cleanup
  139. 04:13processes that happen best when you're
  140. 04:15not getting things,
  141. 04:17you know, you know, dirty or again, I
  142. 04:19think a lot of what we're talking about
  143. 04:20is byproducts of our energetics that
  144. 04:22leave, you know, some damage behind it.
  145. 04:24And I I think we just use a lot of ATP
  146. 04:26and we do a lot of stuff as our bodies
  147. 04:28in and the sleep is time where you can
  148. 04:30not be, you know, producing more of that
  149. 04:32and get ahead of the curve on cleaning
  150. 04:34things up a bit. Um, like pulling into a
  151. 04:36gas station, cleaning off your
  152. 04:37windshield.