Kule mihla, abantu abaninzi bathanda ukumisa inkampu ngaphandle, ngoko ke iibhegi zokulala ziyimfuneko ngokwendalo kwisixhobo sangaphandle kwinkampu yangaphandle. Nangona kunjalo, abantu abaninzi bacinga ukuba xa begqoke isikhwama sokulala, kufuneka nje bavule isikhwama sokulala kwaye bafake ngokuthe ngqo. Enyanisweni, oku akulungile. Ukuba usebenzisa isikhwama sokulala ngokungalunganga, uya kuziva ubanda nakwiqondo lokushisa eliphantsi eliqhelekileyo (-5 °) kunye nebhegi yokulala ebandayo (-35 °). Ngoko ke ungayisebenzisa njani ibhegi yokulala? Yintoni endifanele ndinikele ingqalelo kuyo?