Anyone having sleeping issues in Ireland?

Hi all,

Bit of a weird question but I went for work for a couple weeks to a Mediterranean country and had the best sleep in years even though I slept for differing hours each day (I have a regular sleep schedule in Ireland). Sleep hygiene regimen didn't change, I ate unhealthier than I do here, didn't have alcohol/smoke.

I'm not Irish myself but have lived here for a few years. I've been waking up groggy with a headache, congested nose, bit dizzy and disoriented and it takes me a few hours in the morn to get going but I just took it as something normal, but having been abroad and it changing entirely I'm questioning that. I've been tested for allergies and don't have any.

Anyone else been experiencing similar or has any fixes/ideas?

Cheers