jdsgn: Sleep as long as you want, then travel back in time so you never miss something.
thats a very good use of a time machine :D
a nice adaption would be to make the TM work all the time in real-time:
make it so that the time that passes by is 60 times longer then the real time
mork from mork and mindy was training in a sort of alternate time, it looked like he was very slow or so but he trainded for hours and onl missed a few minutes in earth time :D
Now that would be profitable for yourself.
You design cool stuff that will make you gazilliionaire, this would take maybe 40 years but now its done in 40 seconds, cause when you come back to the real time , only 40 seconds have passed, ofcourse you didnot grow older (40 seconds only) cause for the earth people it took only 40 seconds but you did work that would have costed 40 years.
That would be intresting.
Doing this right, you would kinda live forever.