ઉંધતા ખોલે પણ જાગતા ન ખોલે (જાણી જોઈને).

uṁdhatā khōlē paṇa jāgatā na khōlē (jāṇī jōīnē).

Literally: The sleeping one opens, but the waking one does not open (deliberately).
What it means: You can wake someone who is sleeping, but you cannot wake someone who is pretending to be asleep.

Also said as

ગુજરાતી કહેવતસંગ્રહ (Gujarati Kahevat Sangrah) (1923) · read from the scan by machine — the Gujarati itself is unchecked · English is machine-made and nobody has checked it yet

Heard it differently, or know we've got the sense wrong? Tell us — that is exactly the kind of correction this needs.