less than restful sleep...

ok, so while i spent the bulk of the evening prone and under the covers, i can recall looking at the clock no fewer than 4 times......each episode bringing greater concern for my wakefulness and the unavoidability of this day....I teach a diabetes class today, and must continue to prepare for my first eku class tomorrow......and neither of these obligations should have kept me awake.....i have done both before....the last caffeine i consumed was at 2:00-ice tea.......surely i am not so old that caffeine has such a long half-life.......hopefully my morning coffee can sustain my brain to get through the morning and afternoon.....