It wouldn’t be from morphine because it makes you drowsy, lethargic, nauseous, a bit “dumb” because it dulls everything (I know from experience as well). Though it can make you agitated. If Tiffany is in excruciating pain, it won’t necessarily make her tired enough to sleep… also cuz it causes constipation, but it should lower her level of pain. As for being wired, if she’s on some type of stimulant, antidepressant or steroids, then those could play a part in insomnia and agitation, but we’ve not heard about that.
To me, her state doesn’t look drug-induced, but fear-induced (stress) along with denial working in overdrive to convince herself everything’s gonna be okay “because it has to be in the end”. Her narrative is consistent in that respect, but it’s getting more and more frantic and desperate, esp in this vlog. She’s not prepared for what’s next and deep down she knows it. I’m also worried about a breakdown on the horizon.