Lay the rug back down and press the edges into the floor.
How to get new rug to lay flat.
The rubber backing keeps the edge of the rug from being pushed up and causing a fall.
Normally these rugs have been rolled up for quite some time.
Make sure it lies completely flat and leave it for at least a week before you check the result.
When you get home and try to lay it down where you would like it it will want to roll back up.
Whenever you order or buy a new rug assuming is has some size to it you will get the rug in a roll.
This method should work for rugs that are badly curled at the corners but the rug obviously needs to be the size of the bed or smaller for the best results.
Since the rug has been rolled up for some time it may require a bit of retraining to lie flat again.
How to make an area rug lay flat.
Simply taking the carpet and laying it upside down will also help stop.