It raised my blood pressure and made following mornings very groggy for too many hours.
“It raised my blood pressure”
What you say HAS been reported. But more common is a reduction:
“In a study conducted by Kozirog et al.25, it was demonstrated that patients with metabolic syndrome showed a reduction by a mean of 12.3 mmHg in systolic and 6.5 mmHg in diastolic BP when treated with 5 mg of melatonin 2 h before bedtime.”
Metabolic syndrome is common these days.