Last night I was so tired. I planned to take a short nap (say, less than 1 hour) and then worked on various things (finishing marking student papers, editing book drafts, and so son). But, I ended up having a long sleep.
I did wake up one hour after started to sleep. I was going to wake up, but I thought ... another 5 minutes wouldn't hurt. Alas. Five minutes turned into an hour! After that I didn't feel like working. So I ended up sleeping for 7 hours. Dang! There goes my working hours.
Today I have to sleep less. (But, the sign is pointing to a different direction ... more sleep. ha ha ha.)