Paramedics and police were called to Bluecoat Pond at about 4.10am where the man, aged 32, had returned home with a head injury.
The air ambulance was called but the man was taken by road to St George’s Hospital in Tooting.
A Sussex Police spokesperson said his condition is serious but not life-threatening.
The spokesperson added: “Enquiries are continuing to establish where and how he sustained the injury, but at this stage there is no evidence to show that any crime has occurred.”
A spokesperson for South East Coast Ambulance Service said the man reported he had been hit by a vehicle.
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