I need advice from experienced runners/joggers. (is this normal ?)

I have noticed that on the days that I run after I finish my 1~1½ hour run if I walk for an additional 20~30 minutes afterwards or remain active through out the day, the day after I am well rested and able to run again but if I just take a shower and stay in bed or flop on the couch inactive for the entire day, the next day I feel lethargic and unable to run.