My twin boys are four months old. They go to bed at 7pm and go down easily. They are often still awake when we put them down and they drift off on their own. One will sleep until 5am or so. The other was sleeping until sometime between 3am and 5am, but now he is waking between 12am and 2am. Every night I intend to settle him back to bed, and every night I end up just taking him into bed with me instead. I don't mind, really, because we both get more sleep this way, but I'm concerned that I'm creating bad habits. For a number of reasons, including having to get rid of the double bed in the nursery once they are too big to share a cotbed, this can't be maintained long-term. Should I be making a better effort to settle him back to sleep in his cotbed?