There was No meditation at all in the life of the Prophet Muhammad (S) but he was worshipping Allah (SWT) as all the prophets used to worship Allah.
Meditation is a term used by non Muslims who do not recognise the prophetic worshipping. We, Muslim believe that spiritual uplift meant comes only through worshipping Allah (SWT) in the same way that all the prophets and Ahlul Bayt (A) performed.
Wassalam.