This (mostly) works as long as your sleep metronome and time of day clock are in sync and your system isn't busy enough to cause too much delay between execution of the different lines of code. Not always true:

Sleep metronome:  |      |      |      |      |      |
Time of day:  |  07  |  08  |  09  |  10  |  11  |  12  |
                             A B C
A:  time=...09
    $mod=9
B:  sleep 10-9
C:  localtime=...:09
[download]

You can see lots of ways to move points around on that drawing to get different results as well.

        - tye (but my friends call me "Tye")