how exactly does the epilepsy drug klonopin cause hairloss?

have noticed a huge shed and bald spots at hairline while on 1mg of klonopin once a day for a period of 3 weeks. dr. rx'ed it for insomnia. pretty traumatic for a girl to lose her hair! i stopped taking the drug and just deal with no sleep. dr. WONT prescribe safer drugs meant for insomnia like ambien or temazepam cause hes paranoid about addictive qualities.