Last time round i was really anti pethidine when 'planning' my birth but after a long latent stage (3 days and nights of contractions at home) it enabled me to rest and relax, in one of the articles it says that when sleep deprived your pain threshold is lowered, i agree it can get like that.
The pethidine knocked me out for an hour, then i woke up bolt upright and announced to dh i was pushing so he had better get the midwives! I did then use gas and air as i pushed and baby was out soonish, she immediately latched on and fed as i was having a physiological third stage so wanted to feed to get placenta out.
I think the important thing was as i was birthing in a birth centre and trusted the midwives i was able to confidently follow her advice regarding pain relief, that would be the ideal for everyone. I think dd may have been sleepy the following day and didnt feed well in the day but fed all night, this could have due to the pethidine or purely because she had day and night reversed when she was born, which took a week or two to change.
I would def prefer having pethidine in the circs i did to an epidural as after an hour when the placenta was out i was up and about cleaning baby and having a shower unaided, whereas with an epidural i would have needed time to recover. I may have had a low dose though which could account for it wearing off fast.
I think that all options have a plasce in different labours and circumstances and it is best to go in with an open mind, although reasonable to have prefernces you shouldnt rule anything out as it becomes and added pressure when you want to change your mind in labour but feel you cant.