24 month old daughter tantrums all the time!
My 26mos has been in a rough patch and I know hers is completely lack of sleep. She's not tired at noon like she used to be and sometimes doesn't go down for a nap til after 3 which of course makes nights miserable with bedtime going 10pm or later. Part of me thinks she ramping up to drop naptime (and some days she doesn't) but obviously she needs them so we're in a similar boat. I've made a lot of concessions for the things I've deemed "little" and therefore have reduced the number of things to battle over so it's a bit easier to stick to it for the important stuff. I could have killed my DH when he offered her chocolate milk (it's the non-dairy almond stuff) at 10 the other night - THAT I stood my ground on and THAT was a hell of a tantrum. But yah I totally think sleep is an issue at this age. We're lucky if she gets about 10-12 hours in a day which I think is less than she should be getting (bags under here eyes can prove that!) but so far I haven't figure out an answer to the sleep dilemma! So maybe think about what things are the usual triggers and re-evaluate or categorize them by importance of which ones you'd be willing to let slide. My DD is one hell of an independent kid, painfully so at times, so having easy choices helps her as well.