Never had any problems sleeping. My problem is making myself go to bed. I'm a night owl.

As for missing commutes, it generally only happens on days like today, when, alas, I am dealing with yet another broken spoke.

One thing in my favor - biking actually allows me to sleep a little longer than I would otherwise. My other most viable way to get to work is the DC Metro. Commuting that way takes me an hour. Cycling to work, even with a shower and a change of clothes when I get there, takes me about 45 minutes. Love those extra 15 minutes!!!