It's Bedtime (a.k.a. Wimzie Stays Up Late) - S2.E44

The daycare is going to be on TV Friday. Wimzie goes through her routine at bedtime ""I'm not tired yet, I'm not tired yet."" So Gratziella does an experiment and lets Wimzie stay up late each night, to prove the next morning that she'll be tired. Wimzie is tired, but doesn't want to admit it. This makes Wimzie to tired to watch herself on TV, so just in case, Gratziella tapes the show.