Sorry to be a dissenting voice, but even travelling in the nose of a jumbo becomes tiresome after a while - for any reason.
I'd say it's all got too much when the BA belly kicks in, reminding you that you've been spending too much time reclining in a comfy seat, drinking decent wines and eating rich food.
Good to see there's a fellow cyclist here, it's what I've turned to in order to beat the belly.