Obstructive sleep apnea
If you get enough sleep but still feel run down during the day, you may have obstructive sleep apnea (OSA). Many people who have sleep apnea snore and stop breathing for short periods of time at night without noticing it. This can both cause problems in everyday life and increase the risk of other medical conditions.
Dehydration
People become dehydrated if they don't drink enough water or their body loses too much fluid. The first signs are thirst, trouble concentrating, a headache and dizziness. It then helps to quickly drink enough. Severe dehydration is a medical emergency.
