Perchance To Dream…But Not When Lifting

Muscle strength in lifting, particularly heavy compound movements, is impaired by lack of sufficient sleep; thus: 

Inadequate sleep impairs maximal muscle strength in compound movements when performed without specific interventions designed to increase motivation. Strategies to assist groups facing inadequate sleep to effectively perform resistance training may include supplementing their motivation by training in groups or ingesting caffeine; or training prior to prolonged periods of wakefulness.

If the situation is unavoidable, then do what you can, but the optimal thing is to just get enough sleep (easier said than done in many cases, I know….).