One hour after the Boeing 767-300ER departed from Schiphol, the entire cabin crew indicated they felt unwell. In concert with the company the captain decided to return to Schiphol. After landing the cabin crew were met and checked by a medical team. After the aircraft came to a stop, the high temperature of one of the brakes activated a thermal fuse plug and one of the aircraft tires deflated. The Dutch Safety Board is investigating the cause(s) of the occurrence.