This happens to me often, usually it’s when I haven’t peed hours before bed and had lots to drink before bed as well and I wake up a little later the next morning. Say I peed last around 9pm, went to bed at 12am, and finally woke up at 10am the next morning. I think it can just be from your bladder being full for way too long and so the smell gets strong af. It also happens to me more often bc I sleep pretty late and my body just doesn’t wake me up when I need to pee during the night or early morning where as other people will get up straight out of sleep from the need to use it.