I did Tweddle at home when my DD was around 5 months. I learnt that I needed to focus on getting her to have at least two sleep cycles during her day naps, so that if she woke after 40 mins I spent time resettling her. It was hard work and took a couple of weeks, but then she started having longer naps and better night sleeps too. They introduced me to patting, shhing, using a dummy, etc - but basically not picking her up. I also learnt that I was leaving my DD up too long. At 4-5 months they can only be up for 1 1/2 hours at the most. I was very glad I got the help but I imagine not everyone would like it. HTH