Every time befor I go to bed I get dizzy spells, why is this happening?

Would like more info. Dizziness (impairment in spatial perception and stability) has many potential causes. However, the most common subcategories can be broken down as follows: 40% peripheral vestibular dysfunction, 10% central nervous system lesion, 15% psychiatric disorder, 25% presyncope/dysequilibrium, 10% nonspecific dizziness. You would benefit from seeing your doctor. Good luck.