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Yes, chronic short sleep works against both. In a calorie deficit it made a much bigger share of weight loss come off as muscle instead of fat, and raised hunger. It also weakens compound lift strength and blunts training adaptation. This is about a 5 to 6 hour pattern, not one bad night.
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Under sleeping quietly costs training capacity, makes hard efforts feel harder, and is linked with higher injury and illness rates. The fixes, a consistent schedule, a wind down, a dark cool room, watching evening caffeine, are cheap and low risk.
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For muscle and strength, barely, train when you can be consistent. Strength is a bit higher in the evening, but train in the morning and it rises to match. A weak hint favours evening for muscle. Evening sessions don't harm sleep unless vigorous and within an hour of bed.
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