Bed microclimate control with preparation cycle

A bed system comprising:

• a mattress having a foam layer and an air layer disposed under the foam layer;
• an air controller configured to cause air to flow through the air layer;
• a sensor subsystem configured to sense whether a user is present on the mattress;
• and
• a control subsystem configured to:
• determine that a user exited the mattress during a predetermined time period;
• and
• upon determining that the user exited the mattress during the predetermined time period, initiate activation of the air controller to draw air from the air layer of the mattress to increase distribution of air through the foam layer above the air layer and decrease a temperature at the foam layer.