Yucaipa Valley is a mountain-locked mesa, varying in altitude from 2,000 to 3,000 feet. It is recognized as a fine site for apple and cherry orchards. It is to California what Hood River Valley is to Oregon ... and what Yakima Valley is to Washington. 2
Elevating your legs may help relieve some discomfort. In your case, however, waking up to a discomforting feeling of tired and heavy legs may not be caused by the lack of rest alone and it could be due to insufficient sleep or poor sleep quality.
Fatigue and perceived weakness is common with BFS and can cause weak or rubbery legs, difficulty raising an arm or leg into the air one day, but not the next day, a drained feeling with no energy and even actual weak feelings where your arm just feels like lead and you have to rest it constantly.