So far I am now in my third week of biphasic sleep, and I found out some usefull hints.
First of all, it is a bad thing to try to stick to a fix schedule of sleep time. At first I wanted to try to sleep from 2am to 6:30am, but that meant quite often that I tried to stay awake from 12am to 2am. It happend that in that time I became sleepy most of the time. And when I managed to stay awake till 2am I had a hard time to fall asleep.
So now I just have my time frames in which I could sleep. So the first one of core sleep being between 11pm and 2am (sleeping for 4:30h) and the second one between 4pm and 8pm (sleeping for 1:30h).
If sometime I did not manage to lay down for the nap in the afternoon I just appended 1:30h to the core sleep.
I still have my problems with the afternoon nap, because sleeping then is different from core sleep. I know that I am sleeping, but it just feels like laying awake and trying to fall asleep. Also it seems that I often just sleep for 60-70 minutes rather than the full 90 minutes.
Right now I do have a much better sleeping habit than I had before. I had insomnia and a tough time falling asleep or sleeping through. Therefore standing up in the morning was quite a pain. This totally changed.
Now I manage to wake up immediately (still depending on the alarm though) and also to fall asleep quite quickly. My sleep quality increased, and I dream a lot more. Still got some nightmares sometimes, that keep kicking me out of the 90minutes cycle, leading to being tired when I wake up, but it is okay. A cup of coffee kills the tiredness.
Also, coffee, as opposed to my first week thinking, does not interfere with sleeping. As long as I just drink one or two cups maximum at day, it fits in normally. Same for alcohol. Not too much is okay.
In the end I think that I still am in the adaption phase, because of the small problems falling asleep in the afternoon, but the tough time is over I guess. It is funny being awake when my girlfriend hits the mattress, and being awake when she finally wakes up in the morning, and having so much more time for my chores.
I keep you informed of my further progress.
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