heya hun, may just be a phase due to teething? have you tried remedies for that? for a 10mnth old a rough guide is 2 naps during the day for total 3 hrs, so roughly two 1.5hr naps daily. so that would mean your LO cant stay awake longer than 2-3 hrs without needing a nap during day time, so may be overtiredness.... I know my LO is alot younger but I know he cant stay awake longer than 1.5hrs without getting overtired and fighting his sleep, maybe try putting down for a nap at first signs of tiredness, eye rubbing, yawning from between 2-3 hrs no longer than, and try various tactics, white noise, soother etc and just persevere and just keep saying to yourself, LO will have to fall asleep soon, maybe if that works even though it may take a while LO would realise naps are good again... Also I find when LOs nap well during the day that relaxation follows through for a good night. I know, its all trial and error! x
The only difference I can see between a 7mnth old and 10mnth old is a 10mnth old can stay awake for a bit longer between naps and may only need 2 naps rather than 3 naps per day...sometimes as they get older the routine just needs tweaking a bit.