The answer to the question of whether you can sleep on an Ikea mattress before 72 hours is yes, but there are some important considerations. First, Ikea mattresses come with a warranty that states they should be used for at least 72 hours prior to sleeping on them so as to allow for proper expansion and contouring of the foam layers inside. Secondly, it's important to note that even if you do not wait the full 72 hours before sleeping on your new mattress, it may still take up to 30 days for your body to adjust properly and get accustomed to its new surroundings. Lastly, keep in mind that while a good night's rest is essential for overall health and wellbeing; never compromise comfort or safety when selecting a mattress. Make sure your bedding fits properly around the edges of the mattress and check often for any signs of wear or damage during use - this will help ensure optimal performance from your purchase over time.