Final answer:
Tamar should sleep more on weekends and exercise during the day to sleep better at night.
Step-by-step explanation:
Tamar's journal indicates that she gets a solid eight hours of sleep on Tuesday and Thursday, which are the days she has dance class. This suggests that exercise during the day helps Tamar sleep more at night. On Saturday afternoon, Tamar took a nap but didn't go to bed until late, indicating that she may need to sleep more on weekends to catch up.