30 min naps

5 mo old is sleep trained with naps and night time sleep we did Ferber (3-5-10) Only thing is he always wakes after 30 mins during any sleep, his sleep pressure is higher at night so he’s able to get right back to sleep. For his naps he’s waking after 30 mins and seems ready to be up. Will naps ever get longer? Would you attempt to do Ferber to extend naps?