Was Trevor really insomniac for a year?

I think he had awake for a year, but there's two possibilities depending on the intended realism:

He had been awake for a year (artistic licence):
Trevor would (roughly) know how long it'd been (perhaps estimating or rounding).
Severe sleep deprivation can lead to many kinds of physical and mental problems including: paranoia, weight loss, hallucinations and moodiness.
The rest of the film (Trevor's physical condition, no other duration suggested) would support this.

He imagined it (more realistic):
He'd been awake for a long time but nowhere near a year, perhaps with unnoticed microsleeps.
Records for healthy individuals staying awake without stimulants is around 11 days, however patients with a sleeping disorder may stay awake far longer, the longest on record is a man with FFI (a brain disorder) at 6 months (still far shorter than Trevor).

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