You should try another version of ADHD meds that issue kinda happened to me and I started taking adderal instead it last for 6 hours when Vyvanse last for 12 take longer to get out of system. Vyvanse also made me very depressed.

Yeah, I feel like it lasted more than 12:(

You should contact your doctor and ask for other medicines that are less lasting because you really shouldn’t need 12 hours worth of medicine. Especially of you are in school or work most time you need with meds like this is 6 hours and it’s good for medicine to get out your system and not cause constant problems like Vyvanse can cause. Once Vyvanse caused me to have shakes at night and I would like shiver but I’m not cold. I would also have major headaches.

I've tried modafinil (immediately really bad effects on me) and concerta. Concerta didn't work more than maybe 3 hours. Would lowering the dosage still make it 12 hours?

I’m not sure lowering the dose will lower the 12 hours but I believe lowering the dose will stop with symptoms and that taking it as soon as you wake up is a good idea because it will show like from 9am till 9pm it like should be out your system but pushing the time you take the medicine like at 10 am is very troublesome and can cause that issue with sleeping.

Your body might need to get use to it

You should for sure talk to your doctor asap! That sounds awful :( I'm sorry that's happening.

are you 100% sure that you have adhd and not something else that presents similarly? if a dosage is too high in a general adhd patient it makes them sleepy/zombie-like.

I have narcolepsy and ADHD and they said that ADHD medications are usually prescribed for narcolepsy. So I think they're trying to find one that will help both

There definitely was an adjustment period when I started vyvanse. Can’t take it too late in the day or else sleep will be effected no matter what you do. My doc started me on 30, then I was up to 50, lost a bit of weight and dropped down to 40, but I’m about to ask to go back up to 50 since it’s been a year this month trying to nail down the right dosage and timing. I also take a Ritalin “booster” in the AM before I take my vyvanse around noon. I’ve also been into meditation and it’s been helpful creating a bedtime routine that I had to stick to religiously in order to force my brain/Body to fall asleep naturally.