Correct spelling for the English word "subwaking" is [sˈʌbwe͡ɪkɪŋ], [sˈʌbweɪkɪŋ], [s_ˈʌ_b_w_eɪ_k_ɪ_ŋ] (IPA phonetic alphabet).
Noting a state intermediate between sleeping and waking; hypnoidal.
A practical medical dictionary. By Stedman, Thomas Lathrop. Published 1920.