I found out to get my training, family time, family work and job work done I need to ideally wake up around 5 AM..this is an ideal not always what happens. To get 8 hours I need to lay down around 8:30. I generally find I am not as productive at work after 8 anyway unless it's a particularly interesting project. I also found my awake time between 8PM (kids bedtime) and 11PM was filled with TV, Youtube, or even worse trying to work on a garage project done (which would then keep me up later). I just try to go to bed early and incorporate 80/20 philosophy into my life. In my opinion you can burn the candle on both ends if you are just exercising but not training like SS. If you rest and take care of you first you will be smarter / more efficient in everything you do because work is about results not spending time doing it. Naps are addictive which is why I don't like them, you start wanting one every day which sucks when you cant.