There is vocalisation of the semi-vowel, of the verbs svap 'to sleep', syam 'to shout' and vye 'to cover', when followed by the affix yaṅ of the Intensive.,
Thus सोषुप्यते, सेसिम्यते, वेवीयते 7.4.25 the short इ is lengthened). Why do we say 'when यङ् follows'? Observe स्वप्नक् formed by नजिङ् 3.2.172.,