Laptop is at 100% when i shut it down and below 30% when i open it the next morning. No apps were used. Why?

[Suja Grace]

Hello, I usually plug in my laptop when I'm about to finish working so that it is at 100% when i shut it down. I disconnect it before I go to sleep. When I turn it on, the battery percentage is at 30% or less the next morning and I'm asked to plug the laptop in. And minutes after plugging it in, I find the level at 100%. I tried checking the battery levels in settings and saw a steady decline in battery levels during the night but no apps were used during the period.

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