We push our luck a bit and check at 10pm, 12am, and 5am. Many times that 12am is actually later because my wife gets off work at 11:30pm and sometimes may stop somewhere after work with friends for an hour or so. If I get up to go to the bathroom (and I tend to drink something before bed, so I often do) I will check BG then. Honestly though, I think we used to do better when I simply set my loud phone alarm for 2am. I don't know why I stopped doing that. Likely because of exhaustion. We should probably get back to checking at 2am every night. We can take turns.