My mother-in-law has dementia and often doesn't know where she is. We moved her in with us. Her bedroom was upstairs in her previous home. The only thing that will come of her going upstairs is hurting herself or waking my young children (ages 4 and 1). A baby gate doesn't stop her. She knows how to open them (despite not being able to do hardly anything else for herself). She will often get out of her bed in the middle of the night to go to the bathroom and then head upstairs to "go back to bed". This has led to her disrupting my daughters' sleep every night, which disrupts our sleep and makes for irritable children throughout the day. There is absolutely no reason for her to go upstairs. We don't need a stair lift. We cannot install a door at the bottom of the steps. What can we do to keep her from venturing upstairs?