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Last night I decided to give myself 6 hours sleep, to try and pay off some of my sleep debt. I woke up at the usual time, but with almost no grogginess at all! I also woke up from dreaming again, but I can't remember what I dreamt about.

This morning was really good - me and Yu Lee went out for a 24km (15 mile) rollerblading session which was really fun. When we got back I made us a tuna salad for lunch, and then I started to feel drowsy so I went to the bedroom to sleep.

Unfortunately, today I didn't really sleep very well for my nap. I definitely dozed off for some of my nap, but I didn't sleep the full 90 minutes. I felt somewhat refreshed afterwards and not groggy at all, but I'm sure this is because I just had a light sleep, and it was nowhere near as satisfying as my normal naps.

This evening I feel a bit tired again, and am not sure if I will go for 4.5 or 6 hours tonight.