At 3 months my son started sleeping through the night. He's 2 now and it's hit or miss. Last night he was wide awake at 2am. I could hear him coyly call out "Mooom..." which soon escalated to "MOM!". When I went in his room he told me he wanted to play with the computer. I told him no. Putting a dimmer switch in his room has helped a lot. I was able to get him to stop whining after I dimmed the lights and let him "read" a book.