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Last night I met up with one of my Spanish friends for a language exchange, and as usual we went to a bar and I had a few beers. When I did this on Monday I felt very tired the next day, so this time I decided to get an early night. I went to bed at 11:30pm which would have given me a 6 hour core (4 cycles).

This morning I first woke up at 4:30am, after exactly 5 hours of sleep. I looked at the clock and decided to go back to sleep, but then I woke up again at 5:10am and got up. This is the second time I have woken up after 5 hours, so I am starting to think that my sleep cycles are 100 minutes long, so 5 hours marks the end of 3 cycles.

The other conclusion that I got from this morning's sleep was that my sleep pattern is working! I obviously am getting enough sleep as I am waking up naturally.

Today was the best day yet in terms of my alertness - I felt good (but still very slightly tired) all day. When I got home I managed to sleep for my nap, even though I wasn't that tired beforehand, and afterwards I felt refreshed.

When I woke up from my nap there was a note in the hallway saying:

Stephen,

I have a big headache. Going to sleep downstairs (5:35pm)

Yu Lee

Yu Lee ended up sleeping for over 2 hours, and afterwards she said her headache was gone. Napping must be good for you!

This evening we went out for dinner. We went to Nando's and hadspicychicken and rice, and I had a glass of wine with my dinner.

Right now it is 12:30am and I feel pretty good. The tiredness is just starting to kick in and I am planning to try going to bed at 12:45 instead of 1:00. Normally I have been having 4.5 hours sleep during the night, but as I think my sleep cycles are closer to 100 minutes I am going to try extending my core slightly to see if it makes my mornings less groggy. The ultimate aim is to not even need my alarm clock any more!