Using group policy settings I can manage when computers go to sleep, etc. I also have a KACE 1000 management server which allows me to shutdown computers on a particular schedule. Lastly, most of my computers are set to boot automatically at a certain time in the morning. So – with a combination of these tools – I can shutdown and turn on the computers in different places depending on needs. One set of computers may need to be on till 2:30 am while another set can be shut off at 4:30 pm, etc.