Sound unit?? Glow stick xylophone. Put the glow sticks in cups of water and an aura comes off in the dark, when you tap them. Gotta try this!
"Stay in bed until you see the sun!" Parents set the clock to display a cheerful smiley sun at progressively later times of morning, training the child to get up only once they “see the sun”
Fill balloons with water and add food coloring, once frozen cut the balloons off & they look like giant marbles :)