Mirtazepine And sleep

hi all new to this site my doctor has prescribed 15 mg of mirtazapine I have been taking that dose for a week and all I have wanted to do is sleep fast forward to today day doctor has now double the dose and he saying I shouldn’t feel so sleepy on double the dose I have children so have to be alert all the while can anybody share with me there experiences of doubling the dose of mirtazapine good or bad