He needs to set the duration of his nap.An alarm will ring according to the time or duration set.
After waking up from his nap, the duration set for the alarm will be automatically recorded into his game. He can open up the application under game section to keep track of his sleeping hours and also able to view his friends current sleeping records. At the time, he is able to compete with his friends. He is also able to rate the location of the place he just took his nap.