Reasons for morning dizziness. Dizziness can occur when the fluid in your inner ear shifts, such as when changing positions quickly. If you have a cold or sinus issues, you may notice the dizziness gets worse because you have excess fluid and swelling in your sinuses, which are linked to the inner ear.What causes dizzy spells while sleeping?
Dehydration or Overheating. Dehydration from exposure to heat, exercise, long plane journeys or simple lack of food and drink is a common cause of dizziness when lying down. You may also have low blood sugar levels, so drink some fruit juice or sugary soft drink and see if things get better.