NHS Lothian: SAD Seasonal affective disorder (SAD) is a type of depression that affects people during winter months, and subsides during the rest of the year. Daylight and Sleepio are free apps for people in Scotland and both can support with SAD. Share this: Share on X (Opens in new window) X Share on Facebook (Opens in new window) Facebook Share on LinkedIn (Opens in new window) LinkedIn Like this:Like Loading... Published by davepickering Edinburgh reporter and photographer View all posts by davepickering