My girls are very different personalities and have different sleep patterns. Both will put themselves to sleep - DD1 was a good sleeper from the start and would put herself to sleep very easily but waking up was a completely different story. If she woke before she was ready - oh man! She was/still is an absolute grump! She is like DP, goes to sleep later, sleeps like a log and has trouble waking up. DD2 was harder to get to sleep by herself and she was a co-sleeper but managed to figure it out around 18m. The other thing was she had reflux and although a happy chucker, lying down made her chuck so that caused some issues. Now she will take herself to bed early and wakes early, like me.