I always like to try and save weight, so this is what I do:

• I use a summer sleeping bag, but have used it to tour at all times but winter. If it is cold, I just put ALL my clothes on.
• It is also a mummy bag. If you buy a mummy bag make sure it stretches around where your knees are, otherwise you won't be able to sit up cross legged in your bag.
• I use the shortest & lightest mattress from the thermarest range. It means your feet are dangling but I don't find it too bad. It helps to carefully select where you put your tent, thick grass is good.
• For a pillow, I just take an empty half-size pillow case and stuff it full of clothes. Inside the pillow case put your softest fleece on the top-side so at least it is smooth where you lay your head.

I always find the best way to guarantee a good nights sleep is to have ridden a v.long way. If I have only done a short distance I will substitute with a few beers :-)