Could you change it to item frames with a map on it (that makes it look like a supply crate)? I'm not sure this is possible, because it's entities not blocks. But I thought it would be cool to have it.
Your body goes through sleep cycles,
Light sleep,
Deep sleep,
and REM sleep.
REM sleep (Rapid-Eye-Movement) is when you have your dreams.
These sleep cycles last about 90 minutes. If you wake up at an interval of 90 minutes you'll wake up in light sleep and won't feel super tired because you...
Another tip: Wake up at intervals of 90 minutes. (So set your alarm clock at an interval of 90 minutes after you go to sleep) I'm guessing you don't want me to go through an explanation so yeah :P
It's actually possible, and gets easy once you know what to do. 50% is luck, 35% is knowing where to go, 15% is skill. (Half the time you make it if you know where to go and can do the parkour without stopping or little stopping)