These reads were what really piqued my curiosity on this project, and I will summarize in short what they are about!
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Everyone’s body has internal mechanisms that controls the timing of certain activities, and usually works independent of external environment. These mechanisms, or “clocks” are termed as circadian rhythms presents a cycle of physiological and biological processes that fluctuate on a roughly 24-hour schedule. Interestingly enough, we do not have only one body clock, but a few that control different aspects of our physique!
The following posts suggests that our body relies primarily on the presence and absence of sunlight to gauge its timing for bodily processes. So what happens when we do not get enough sunlight? Does that affect the way we function during a day and night?
Read more here.
Does your body’s activity peak during certain times of the day or night? And when are these times? 
Do comment with your name and a lil detail about your geographical location and current occupation; it would be interesting to know!
location: new york city
am living the hazardous college lifestyle in ny, where a 4am grocery run is entirely plausible and often but a minute away. all-nighters are pretty common on my campus, and people are oft still wandering around the floor at 6am.
ie. whatever circadian rhythm we’re supposed to have, its probably irreparably screwed up by now. you should see the redbull junkies around here…
that said, i still function better in the day when it comes to more cerebral tasks. exercise performance wise- uh definitely huffin & puffin less if i jog in the evening– probably because i wld have consumed a loaf of bread and a gateau au chocolat by then. these things are supposed to be give u energy, non?
location: Singapore/Melbourne
Sleep has always been of utmost importance to me, and I’ve always ensured a minimum of 8 hours even when I’m busy/stressed. Without sufficient sleep, I notice many changes in my body and mood, and as a medical student, I am always interested in our ‘in-built’ circadian rhythm.
An interesting observation I’ve come across recently is the explanation of the well-used phrase ‘beauty sleep’. During the sleep cycle, our body releases human growth hormone (hGH), which is recently hailed as a wonder supplement that is miraculously anti-aging. Hence sleeping sufficiently will allow adequate production of this hormone and keep us young and beautiful!
Location: United Kingdom
Been successful in avoiding pulling all-nighters since the new term started.
Standard sleep cycle: 8 hours of sleep.
Wake up times: 1.5 hours before first lecture. Hence it varies from day to day.
Sleeping times: 8 hours before wake up time. haha duh.
Exceptions: Saturday mornings = No alarm
Observations: 8 hours of sleep seem quite ideal. I feel quite awake the moment I’m up. Recent sat mornings show that I automatically wake up 8 hours after.
Oh this might sound quite weird, but I hate it when I have to wake up in the middle of the night to go to the toilet. Take ages to get back to sleep after that. Haha. So yea, perhaps diet has a part to play to on your sleep cycles.
I do not function well when I am sleep deprived. It’s almost like some crazy LDMR when I try to sacrifice sleep to work. Hence the decision to guarantee at least 8 hours of sleep.
Hope this helps.