I put DS2 to bed at 7 pm, he wakes multiple times at night but is usually still asleep when my alarm goes at 7.30am. My MIL thinks I'm bonkers to put him to bed so early and that he'd sleep better if I put him to bed at 9 pm or so. While I'm sure he doesn't wake at night because he isn't tired, I do wonder why so many British and American books on infant sleep insist on an early bedtime. Is there research to back up the theory that it improves sleep? I can't believe that all babies in countries where late bedtimes are the norm sleep badly!