Isolation Changes Our Perception Of Time(Unifrance)
The 48-Hour Sleep Cycle In Isolation(Business Insider)
Our Internal Clocks Need The Sun(Science Alert)
Permanent Jet Lag(Healthline)
Boredom = Sleep
I can tell you though that it became very difficult toward the end and I felt terribly worn out ... At the start of my stay, I read, and then I lost the desire. I didn't suffer from the cold. I was well heated in my little tent. My tape recorder refused to work the first few days, but later, I managed to repair it, and I listened to music. Outside of that, I knitted and knitted some more and looked forward to the time when I would finally see the Sun.