Upstairs toddler keeping me up at night

[NYA28]

I bought a flat 2 years ago, which I worked very hard to save for. There are two 1-bed flats in a converted house, I’m on the ground floor. Upstairs is tenanted and all’s been fine until about 3 months ago when a new family moved in (2 women, a man and a toddler around 18 months, unsure of the dynamic there.) I said hello a couple of times when they moved in but they weren’t really forthcoming, didn’t tell me their names or anything and gave the impression they don’t want to talk so we just keep ourselves to ourselves.

My issue is the toddler who likes to run, jump and throw things between (quite specific times of) 2-8am and in the evening around 7-11pm. This is in the room above my bedroom and obviously the ceiling is very thin in these types of buildings so this disturbs my sleep, to the point now where I’m starting to feel unwell from lack of sleep, both mentally and physically. The toddler is pretty quiet during the day and I don’t hear the adults much either (I’ve been WFH since the pandemic).

I understand the parents probably aren’t thrilled by their kid being awake at night and I don’t expect silence 24/7 when living in a flat and I get small children make noise but was wondering if they could do anything to help ‘soften’ the noise at night, like get the toddler to wear slippers or put some rugs down- but I’m not sure how to say this to them?

Also, in the 3 months they’ve lived here, I’ve never seen them take the baby out at all. We live opposite the beach and at the end of the road there’s a lovely park with a playground- I feel like if the baby could run around during the day outside instead of being bored in the flat he wouldn’t be so active at night? Again, don’t feel like this is my place to mention this to them?

What’s the best way to approach this? I feel bad that my first conversation with them would be me complaining but it's affecting my day-to-day, could I maybe put a polite note under the door? I’ve tried earplugs, sleeping on the sofa and at the moment I’m spending whole weekends at my mum’s just so I can get a decent night’s sleep- any serious advice would be appreciated.

@Paint69 Cystic Fibrosis is a terminal illness! Unless she’s lucky enough to get a lung transplant which might buy her a few more years. I think I’d have ‘health anxiety’ If I had to live with a disease like that

@SmidgenofaPigeon poor choice of words, no need to be patronising.

I feel sorry for you, you shouldn't have to move rooms, use white noise or wear headphones in your home due to the thoughtless behaviour of others.
From what you've said, logically it seems like the toddler sleeps most of the day (probably why they don't take them out) and is active from evening onwards with a three hour map around midnight.
You will have to let them know just how much the noise is distracting your sleep but maybe suggest rugs etc to soften the noise.
The fact that they seem to be ignoring visits from health visitors is worrying.

If it's consistent, as in 4+ nights a week then contacting the council noise team is you first port of call - they can involve social services etc as required . It could be a shift pattern situation, I've had friends with this issue next door, and the parents there didn't take the kids out, hv did persuade them to get them on a more typical sleep pattern by getting them into a council nursery at 3 where the family could be monitored more. They moved away after a few months.