Dizziness when standing up occasionally happens to all of us and then it is not a cause for concern. However, this is not the case when the problem occurs on a regular basis, in which case it is worth looking for the cause. Dizziness on standing up can be associated with a wide range of abnormalities, from dehydration to low blood pressure or... obstructive sleep apnoea. But how can one suspect the specific cause of morning dizziness?