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1.They can also cause sufferers to move back and forth between being wide awake and really sleeping.
back and forth 反复地，来回地
The wind moved the trees gently back and forth.
风吹得树轻轻地来回摇晃。
He swam back and forth five times up and down the swimming pool.
他在游泳池里游了5个来回。
Francesca giggled and watched Kincaid's head shake slowly back and forth.
弗朗西丝卡咯咯笑了起来，看着金凯的头慢慢来回摇着。
