Hello , Welcome to healthcaremagic.com and thanks for sharing your concern with us . Vyvanse is a nervous system stimulant and insomnia and irritability are its major side effects . If the symptoms of sleeplessness started after using vyvanse then discontinuation of it should resolve the issue , and I don t recommend to take any sleep medicine . First should try lifestyle modifications which in most of the cases resolves such side effects . I would suggest him to go to bed at same time everyday which will help in having a good sleep and will balance the circadian rhythm . Exercise regularly atleast 5 days a week which can include brisk walking for 45 minutes or jogging and other aerobics . Eat a healthy diet full of veggies and fruits with sea food , fish and white meat like chicken . Sleep in dark and in morning try to sit in day light for 5 to 15 minutes to recorrect your body clock . Avoid smoking and alcohol . Don t watch tv atleast 2 hour before going to bed . Avoid anything which can distract you in sleep . Don t eat just before sleep , Dinner should be atleast 2 hour before going to sleep . Don t take naps in day time . Practice deep breathing exercises for relaxation . I would again inform you that in your case it looks that these sleep related changes are side effects of drugs and you don t need to take another medicine to come out of it and should follow life style modifications which will definitely be enough to come out of it . As you want to discontinue any medicine , you should inform your healthcare providers about it . Best Regards , DR.S.TOMAR