I am a light sleeper. I have always been a light sleeper.* In college I lived for one semester in my sorority house. My bedroom was next to the front door. I would wake up anytime someone came in for the night, but not because they were noisy. The sound of the deadbolt turning in the lock would wake me up. It's pretty ridiculous.
As you might imagine, having a baby has NOT helped me sleep any better. I was waking up at EVERY sound she made. I've found the best thing for my sleep is to be somewhere where I can hear her when she wakes up but not the noise she makes while she sleeps. This works out pretty well. Kalena usually sleeps from 7 or so until somewhere around midnight, eats, and goes back down until about 3:00 am or so. Here's the problem: these days I wake up when I DON'T hear her. The nights when she sleeps better than usual after her first night feeding, I wake up between 3:30 and 4:00 am because I haven't heard her. Instead of being able to sleep longer because she's sleeping longer, I wake up and then just lie there (lay there?) waiting for her to wake up. I can't even manage to just look at the clock and go back to sleep! It's obnoxious.
It's a sad day when you realize your 3 month old sleeps better than you do.
*For a while when I was 21 or 22 my tonsils got really huge and kept me from breathing right at night. This caused me to sleep really heavily, but as soon as I got them out I went right back to being a light sleeper.