Lights
You can turn the lights on and off with this icon.
You must turn them off when your Tamagotchi falls asleep.
Choose the first option (おん) to turn the lights on and the second one (おふ) to turn them off.
Your Tamagotchi will get sleepy half an hour before their bedtime.
They'll start yawning when that happens.
If you turn the lights off during that half an hour, they'll fall asleep and get a Happy heart.
If you don't, your Tamagotchi will fall asleep with the lights on.
You must turn them off within an hour. If you don't do it in time, you will have made a mental care mistake... 
It doesn't matter if you turn them on again after turning them off, though...
Your Tamagotchi will turn on the lights on their own when they wake up.
