And if you're into more serious water work, say training for a triathlon, open water or Masters swimming event, you undoubtedly swim mostly freestyle and can use backstroke as a restorative just as Marsh's troops do. Both are easy to fix. Get your bearings. Use a line of tiles or lights or other markings on the ceiling to help you set a straight course. Failing that, just hug the lane line.
Most pools have a set of colorful pennants hanging across the pool near each end wall.
Balance your body on your back. On your back, you keep your butt from sinking by leaning on your shoulder blades and the back of your head. That will keep your hips near the surface and you'll ride the waves like a pro, relaxing as you go.