、。
I'm not really sleeping — just dozing.
Literal
Really sleeping [dismissive-なんか] not, dozing am-doing only.
うとうと is a 擬態語 (state mimetic) specifically for light, drifting sleep — dozing off, nodding off. ~なんか ('something like, not really') dismisses the idea of proper sleep. ~だけ ('only/just') limits the action to light dozing.