3. Bedding
Even if you are one of those rare individuals who only gets 6 hours a night of sleep, you still spend 42 hours in bed, or the equivalent of a work week. No one would buy an uncomfortable work chair, so why apply the same philosophy to your bedding? This includes spending the extra dough for a nice mattress, sheets, pillows, etc. There are even many mattress vendors that allow you to try before you buy. For example, Casper allows you to try one of their mattresses for 100 days and even does the return at no extra charge.