Charak Samhita
यदाऽसौ समवस्कन्द्य हृदयं हृदयाश्रयान्। समावृणोति ज्ञानादींस्तदा तन्द्रोपजायते॥२२॥
kapha aggravated by vata in association when gets lodged in hridaya, obscures the process of jnana, tandra (drowsiness) occurs.
english translation
yadA'sau samavaskandya hRdayaM hRdayAzrayAn। samAvRNoti jJAnAdIMstadA tandropajAyate॥22॥
hk transliteration by Sanscript