I don't understand flossing, the tape won't fit between my teeth, if I force it , it just gets stuck and then breaks......

In the morning everyone gets stuff on their teeth, it's normal.
Don't drink anything but water if you need a drink when you are in bed, other wise all the sugar from drinks stick to your teeth and stay there all night.

Rinse warm salt water, It's good to rinse after you eat food too.

You can buy those teeny tiny tooth brushes that will fit into any small gaps, I use these instead of flossing.