I find it best to take it every 4 hours. This way you keep it in your system. Levels might fluctuate, but you will always have it in yur system.
I do like to take a big dose before i go to bed, and i set my alarm clock for 4 hours after i go to bed, wake up pop another big dose of dbol and down a prot shake.
Why abig dose before i go to bed? Why a big dose in the middle of the night with a shake? EASY because when does your body regenerate and grow the most? When you sleep. So it would make sense to dose up during your sleep for extra growth.
I didn't do this until my last cycle, and it made a difference. I really grew to the max