Thanks a lot for the advice gayleggg & CosmicRose... ♥

To gayleggg: Ok, that's a really cool idea, I'm gonna try it. I'm gonna try put a timer near me & do it. Thanks a lot for this idea Hope that it works this time.

To CosmicRose: I tried skipping the nap hour during the day, but I found out that on the contrary the nap hour keeps me refreshed for the rest of the day & when I sleep at night, I sleep well, I don't have problems in that. But when I don't get the nap hour, I really become so tired & sleepy for the rest of the afternoon! Perhaps it depends on our different physiological/psychological needs