Nanna1 (https://poiscenter.com/forums/index.php?topic=2900.msg26917#msg26917) posted a few things about sleep and circadian rythm, copy paste this section:
(https://media.springernature.com/original/springer-static/image/art%3A10.1186%2F1741-7015-11-79/MediaObjects/12916_2012_Article_744_Fig3_HTML.jpg)
Manipulating the sleep-wake cycle and circadian rhythms to improve clinical management of major depression (2013) (https://www.ncbi.nlm.nih.gov/pubmed/23521808)
(http://brainimmune.com/wp-content/uploads/2011/07/T-Cell-During-Sleep-Fig2.jpg)
Figure 2 T Cell and Antigen Presenting Cell Activity During Sleep (http://www.brainimmune.com/t-cell-and-antigen-presenting-cell-activity-during-sleep/)
(http://www.brainimmune.com/wp-content/uploads/2011/07/T-Cell-During-Sleep-Fig-5.jpg)
Figure 5 T Cell and Antigen Presenting Cell Activity During Sleep (http://www.brainimmune.com/t-cell-and-antigen-presenting-cell-activity-during-sleep/)
(https://i.imgur.com/HzZX1b4.png)
(https://i.imgur.com/BwWIslE.png)
(https://i.imgur.com/FzLyQcN.png)
White circles: 24 hour sleep deprivation, Black circles: 24 hour normal sleep. Gray region (23:00 - 7:30): sleeping period
-Number and Function of Circulating Human Antigen Presenting Cells Regulated by Sleep (https://www.ncbi.nlm.nih.gov/pubmed/17520784)
(https://i.imgur.com/TWl4Eys.png)
Effects of sleep and circadian rhythm on the human immune system (https://www.ncbi.nlm.nih.gov/pubmed/20398008)