Lindsey Ellefson is Lifehacker’s Features Editor. She currently covers study and productivity hacks, as well as household and digital decluttering, and oversees the freelancers on the sex and ...

I’m Chris Kobesko, a Licensed Professional Counselor (LPC) with over 20 years of experience helping people gain a deeper understanding of their behaviors and overcome challenges like chronic insomnia.

Many medical problems, such as traumatic brain injuries, stroke, dementia, and even cancer, can affect the brain and make it difficult for someone to think or process information. Cognitive ...