"If you have an opportunity for an afternoon nap, particularly after a poor night of sleep, take one; you will feel more alert and energetic afterwards. Following a mid-afternoon nap, performance may temporarily deteriorate due to grogginess. However, once sleep inertia dissipates (usually 5-20 minutes), mood, energy, and subjective alertness improve beyond baseline; in sleep-deprived individuals, objective alertness and performance also improve. In non-sleep deprived individuals, improvements in performance have also been documented when measured 1.5 to 12 hours after a nap, particularly when naps are scheduled in preparation for all-night work shift. Naps should be limited to 45 minutes and avoided after 4:00 p.m.;otherwise, one may enter deep sleep, which may cause grogginess for a period of time after the nap and reduce the pressure for sleep that night."

heh. that's what i'm experiencing at this moment. Was particularly sleepy this morning cos I slept late last night, but I took a nap during lunchtime (sacrificed my eating time) and now i'm feeling super alert and quite refreshed. hahaa.

the bad thing is, i've not rehearsed for my auditions later. T_T