Ostensibly, I sleep from around 11:30 to 7:15, a total of 7 hours, 45 minutes or so. However, I think I've identified a list of "zones" where I lose sleep. See if this matches what you all have in your notes:
1, Going to bed too late--This is my fault mostly, and it runs from a little to a lot late. Lets say, on average, 12:00 am. So there's 30 minutes gone.
2, Falling asleep. These days this isn't an issue. It used to be, when I got more sleep, but now, mercifully, i fall asleep quickly. No real loss here.
3, Children coming into bed: anywhere between 1 and 4 AM, figure 15-30 minutes of being awake with them, or having trouble getting back to sleep after.
4, Cat. The cat likes to play at around 4:00 AM. She doesn't come wake us for this fun,but her little bell, and the fact that she's ZOOMING up and down the hallway and stairs...Figure 15-30 minutes.
5, Daylight sounds. This depends on the time of year. Summer, stuff starts getting loud by 5:30. Again, figure 15-30 minutes at best, longer on a loud bird day.
6, Kim's alarm clock. She has one that I bought that lights up slowly to wake her as if the Sun were in the room. Lovely. And she has it going off usually about 6:15. If I catch a wiff of it, I'm out 45 minutes sleep.
7, Garbage trucks. Twice a week, 6:00 AM. Bang bang. Whee!
8, Bathroom break. Figure 15 minutes every night, depending on how dry it is in the house (e.g., how much I need to wake up to drink during the night).
So, sum total? A lot of lost time of a night that's not that long to begin with. Add in waking imperceptibly 50 times/night and one might see why I'm tired.