Sleepiness during the daytime
Nearly every person feels dizzy or sleepy on some days. The reason may be the less sleep they are getting, or the quality of the sleep is not very well to refresh them up for the day. The daytime sleepiness or drowsiness makes the person less concentrated on the work. A sleepy person becomes less productive and less competent in his job due to insomnia. The daytime sleepiness might be a result of just a few restless nights. Moreover, if you are not able to get uninterrupted sleep during the night, you perform worse, and even one night can make sleepy the other day.