Hi mama, I'm not sure how your bump size is like, cause as it gets bigger it does press on the arteries a little and affects your circulation. If it's very bad, I would suggest for you to inform your gynae at the next visit just to make sure it's not something else affecting you. I did have difficulties breathing but I'm asthmatic and I'm already on long term medications pre pregnancy. I'm also monitored by my respiratory doctors during my pregnancy. As for breathlessness during sleep, it only got bad for me from third trimester. Hope all goes well for you!