Abstract: A customizable sleep system includes a mattress, a mattress topper, and/or a pillow for accommodating the needed or desired body support and cooling of users. The system may include a mattress comprising one or more upper support members, each upper support member including multiple foam layers having at least one of different thermal conductivity characteristics and different glass transition temperature (Tg) characteristics and one or more lower support members, each lower support member including multiple foam layers having different support characteristics. The system may include one or more pillows each including multiple distinct foam layers differing in at least one of a support characteristic, a thermal conductivity characteristic, and a Tg characteristic. The system may include a mattress topper with one or more support members which each include multiple foam layers differing in at least one of a support characteristic, a thermal conductivity characteristic, and a Tg characteristic.