Which of the following is likely to cause sleep problems

A)  Establish a daytime exercise program. 
B)  Vary the time when you go to bed at night. 
C)  Minimize consumption of stimulants such as caffeine and nicotine. 
D)  Avoid daytime naps if you're having trouble sleeping at night.

Sleep Problems

Issues related to sleeping, such as difficulty falling or staying asleep, which can affect overall health and well-being.

Daytime Exercise

Physical activity performed during daylight hours, which can influence circadian rhythms and overall health.

Stimulants

Stimulants are substances that increase activity in the brain and body, often leading to increased alertness, attention, and energy.