Guys, what are the best tips to sleep better at night?
Sleep on a comfortable mattress and pillows. Make sure your mattress is comfortable and supportive. The one you have been using for years may have exceeded its life expectancy about 9 or 10 years for most good quality mattresses. Have comfortable pillows and make the room attractive and inviting for sleep but also free of allergens that might affect you and objects that might cause you to slip or fall if you have to get up 
I agree, nothing can replace a good mattress. I've got my eyes on one of those jelly filled ones. An expensive thing but it's worth it.