Waking up refreshed is a distinguished way to start out the day on the right foot. However,there may be times when you wake up tired and unable to immediately get the day going, even though you've had a full night's rest. Here are some things that may be causing you to wake up groggy.
Waking up in the improper phase: Your sleep is split into cycles, or you might've woken up during the non-REM stage,which is a state of very deep sleep. Try to shoot for waking up during an REM phase, because then your body will be better prepared to wake up.
Poor quality of sleep: It doesn't matter how long you sleep for; whether it's low-quality rest, and you'll just wake up tired. Poor-quality sleep can be caused by factors such as sleeping with a pet,drinking caffeinated beverages late in the day, or having too much noise in the background.
Medication hangover: The effects of certain medications that cause drowsiness can linger until the next morning. Check with your doctor to see whether you can adjust the dosage or change medications.
Medical condition: Certain medical conditions like sleep apnea can disrupt your night's rest. Disorders like depression can also cause you to feel drained of energy, or a symptom that can contribute to your grogginess.
Your body clock is not in sync: whether you've been keeping an erratic sleep schedule,then your body will probably need time to adjust to waking up at a certain time during the morning. Try to design a more regular schedule, and you'll probably see a difference in how you feel in the morning.
Source: popsugar.com