January 16, 2000 :: 7:20 a.m.

Went to bed last night @ 9:30 p.m. to catch up on sleep. Woke @ 1:30 for a press check; back to bed @ 5 a.m.

Woke up @ 7:20 with a pretty bad one. This is a weird trend -- headaches about 4 hours later than normal, on the days when his sleep pattern has been interrupted.