Melatonin increasing motion sickness?

I am not asking for medical advice.

I recently flew from NYC - LDN and I got extremely motion sick on the plane, I’ve never experienced this, never even felt dizzy on a plane. I had been taking melatonin a few days before.

Today, I was on a train and got incredibly nauseous, dizzy, mouth watering. Never in my life have I ever become nauseous on a train. It stopped a while after I disembarked. I had also taken melatonin the previous night.

I’m wondering if melatonin is increasing my sensitivity to motion sickness? I get very sick on boats and sometimes in cars, but planes and trains are completely new to me.