When you get your new mattress
Once you remove your new mattress from its packaging, leave it uncovered for a few hours to allow to air. If you have a rolled up mattress, you need to leave it to flatten out in a warm room for 24 hours before using it.
When you first start using your new bed, it will probably feel a bit different to your old one, so please allow time for your body to adjust to the new level of comfort, support and the mattress fillings to settle.