If you have a difficult time staying awake and alert during the day, you may be experiencing excessive daytime sleepiness. Dr. Virend Somers, a Mayo Clinic cardiologist with a focus on sleep medicine, explains the difference between being tired and being sleepy and how excessive daytime sleepiness can have a negative effect on the heart. Watch: The Mayo Clinic Minute https://youtu.be/-7jHlm8PdpU Journalists: Broadcast-quality video (1:03) is in the downloads at the end of this post.…