Please choose the correct ending to complete the given sentence: Health: [header] How to get your child out of bed in the morning [title] Install a natural wake-up light in your kids' bedrooms. [step] Light is an awesome director of your body's natural clock. Light naturally makes you wake up and dark naturally makes you tired.

Ending1: The most common types of natural light there are : [substeps] E-lamps air conditioners a gas stove an electric fan [title] Install an alarm clock for school. [step] You can either set it to be hitting your clock back and forth, or, you can simply turn the clock up to keep it going. Ending2: All this power actually comes from the natural way light changes your brain's circadian rhythm, which is what happens when your body's sleep clocks are shut off. Most teens will start waking up in the morning, but some teens will wake up before one. Ending3: The natural light shifts your body clock to sleep mode, which naturally starts the fall and finish cycle. [substeps] Put a set of egg whites and a little lemon juice in your kids' room, or use aromatherapy oils like pine or rosemary infused oils. Ending4: Because not all areas of the globe will actually have the sun at the times you want to get up and go to bed, using a natural light lamp can work just as well. [substeps] Some of these lights also have built-in sounds that can be played while your kids are falling asleep.

Answer format: ending1/ending2/ending3/ending4