anyone has problem with toddler's sleep? my son 3 y.o. doesn't want to sleep. Make me awake until 3 am or 4 am almost every day!

I'm facing the same problem since the last week or so. My 2yo doesn't want to sleep and it's almost always past 12 in the night. She sleeps for around 1.5-2.5 hours in the afternoon. While I haven't been completely successful and trying different things, I'll tell you what I have been doing: 1) We are trying to shift her afternoon nap to before 3pm and take her to the neighborhood park in the evening. That way she's tired enough for a good night's sleep. This has worked more often than other approaches. 2) Switch off all the lights in the entire house. She keeps on babbling, we keep telling each other stories and before she knows, she's fast asleep. 3) Read a book for around half an hour before sleeping. She gets drowsy enough looking at the same pictures and asks to be put to bed. Hope our nights get back to being peaceful again :)