Thanks for your help. Don't quite know why I put "the night is coming late": meant to stay "the night is getting late". I like the poetic approach "Tha solas an là air falbh" and thanks for help re stopping. Will keep trying!
Feumaidh mi stad / sguir agus a dhol dhan leabaidh. Tha an oidhche a’ tighinn anmoch agus dùisgidh mi trath a maireach. Tha mi sgìth agus tha mi ag iarraidh a bhith nam chadal.