I’ve had the ‘gate’ thing too.
Commute takes me home over some hills .. 5 miles of bridleway and farm track. Suffice to say I don’t do it so much during GMT (when it starts too dark to see after 6pm)
I’ve let the gate slam on me, then another 30 seconds later hear it again. Look over my shoulder. Nothing.
Pedal like hell till the next gate and I have to get off, still nothing. Turn my light off, turn it back on, turn it off, turn it back on and wave it around sit and wait for 20 seconds. Shadow coming down the hill behind me.
I pap my pants, then a light comes on. Another cyclist. Claimed he enjoyed riding with lights out and feeling his way. He’d been trying to keep his distance from my lights so as not to ruin his night vision, but of course I kind of forced the catchup by stopping, and he’d figured he’d spooked me by the way I’d taken my light off and was shining it all over the place.
I’d tried riding with ipod on in the dark once so I couldn’t hear noises, but that didn’t work. Just meant I was wanting to look over my shoulder even more. Decided that if I was ever going to be mauled by axe-murdering-were-pheasants I’d like to hear them coming and psychologically prepare myself first!