Lateral thinking may be dreams
or even nightmares. It is a form
of supine thought which could be
induced by a deep sleep or often
enough (insomnia) if one choses
to stay in bed whilst ruminating.

Vertical thinking, a sapient state,
synonymous with **** Erectus,
can be accurately described as
“ Pensée Avec La Petite Tete “
which is more of a male domain,
usually accompanied by R.E.M.