Everyman Schedule

My new everyman schedule is this:

schedule2
2:00AM-6:30AM core 4.5 hours
<6>
12:00PM-12:20PM 20
<8>
8:00PM-8:20PM 20
<6>
total:5 hours

Sleeping for 20 minutes and getting up is easy but sleeping for 4.5 hours and getting up is difficult. I don't have enough alarm clocks (Actually I have only one and it's very quiet) so it may be bit difficult.