So 2 days ago I accidentally fell asleep on the couch whist watching a video on youtube and I woke up and my Lenovo A6000...

Try checking in your settings if you can adjust the screen sensitivity because some screens are very sensitive so like if you have oily hands or just any form of moist on your screen it might click another thing instead of the one you actually clicked/pressed if that makes any sense

Try deleting/moving some files/apps/documents you don't need on your computer because it might probably just be because you've used up most of your RAM. You can also try updating your antivirus, expanding your RAM storage. If all else fails just get your computer to be reformatted. Tip: Make sure you copy all important files and documents because EVERYTHING would be erased once you get it reformatted.