God yes. In fact, sometimes if something wakes me up in the middle of the night or the early morning I use it as an excuse to check missed messages, emails, other notifications, before falling back to sleep.
The truth is that I text about five people regularly: my mother, my sister, my best friend, and two other friends. It reaches the point where I THINK I hear the Tri-tone sound and I pull the phone out of my pocket.
I don't really check email all that often, but sometimes when I'm out I'm always checking my Facebook app (amazing in and of itself because the iPhone FB app is GARBAGE) and I feel bad about it a bit after.