A member training hard but sleeping five hours a night is working against themselves without realizing it. Muscle repair, hormone regulation, and even next-day motivation all lean heavily on sleep quality — far more than most gym-goers give it credit for.
Recovery happens at night, not in the gym
The workout itself is the stimulus for change; the actual adaptation — muscle repair, strength gains — happens during rest, and sleep is where most of that rest occurs.
Poor sleep quietly sabotages consistency
A tired member is a member more likely to skip a session, not because of low motivation, but because of genuinely low energy. Encouraging members to treat sleep as part of their program, not separate from it, often does more for consistency than any schedule change.
It's worth trainers mentioning sleep explicitly when reviewing a member's progress — a plateau is sometimes a recovery problem wearing a training-plan disguise.