Since the concept of "time" is impossibly difficult for a toddler or young child to grasp, I decided to make a special clock with visual cues for waking up.
For my clock, I decided that they needed to stay in their beds until 6 a.m. So I colored 5 a.m. to 6 a.m. RED.
I then decided that I was fine with the girls reading or playing quietly IN their room from 6 a.m. to 7 a.m. So I colored that hour YELLOW. Next, I decided that at 7 a.m. they would be allowed to come out of their rooms to begin their day. So I colored 7 a.m. to 8 a.m. GREEN. Last, I placed a circle sticker on the hour hand of the clock.
I then explained the clock to my girls as follows:
-RED means STAY IN BED it's still time to be sleeping
-YELLOW means MELLOW activities (reading or quiet play)
-GREEN means GO and they can come out of their room
This clock has allowed my girls to manage their own morning. It has helped them know when it is time for sleeping and when they can come out for the day. They are happier because they have control over their morning, rather than feeling like they don't know if they should wake up yet. And I am happier because we can all begin our day at a reasonable hour!