Light control is a physical setup question, not a guaranteed outcome.
Window edge
Check where curtain panels overlap and where light enters around the sides. Test removable clips on a hidden fabric area and remove them before opening the curtain.
Door line
A soft floor roll may cover a visible line beneath some interior doors. Never block an exit, fire door, ventilation path, or accessible route, and remove the roll from the walkway.
Personal fit
A contour mask should rest lightly and be removed immediately if it creates pressure or irritation. Light reduction varies by fit and room conditions.