How to best support a friend who has a very high needs toddler?

Hi parents,I'm going to try to keep this brief. My best friend (we'll call her M) has a son (16 months) who has his whole life been quite "high needs" - terrible sleeper, fussy eater, constant breastfeeder and just generally a bit unsettled. He is a lovely and loving child but he is hard work and I know my friend is struggling.The biggest issue M has is that her son does not sleep well AT ALL. Must still be feed to sleep, often has to be held to nap, fights naps constantly and screams for hours in the night, then is awake for the day by 5am. She has been to inpatient sleep training through the hospital and has tried to sleep train at home in various ways but nothing seems to stick.I love my friend and her child and I really need some advice on how to best support her. After over a year of terrible sleep and constant battles she is understandably exhausted and demoralised. M is quite open with me in saying that she has called her husband during the day and told him she hates their son. I know that this is coming from a place of exhaustion and not her true feelings and I really want to help her enjoy motherhood.I'm hoping to get some advice from mums (and dads too!) who've been in a similar situation to the one my best friend finds herself in. How did friends and family help you cope? When you vented about issues what were the best responses? Did you just want a sympathetic ear or did you want suggestions/action plans?Thank you for any and all advice you can give me! via /r/Parenting http://bit.ly/30KV9Y0