Astanga Hrudaya
अतिव्यवायमायासं भारं प्रावरणं गुरु। अकालजागरस्वप्नं कठिनोत्कटकासनम्॥४४॥
Forbidden things for pregnant woman: The pregnant woman should avoid excess of sexual activities, exertion carrying heavy loads, heavy coverings, keeping awake or sleeping at improper time, sitting on hard seats, and on heels;
english translation
ativyavAyamAyAsaM bhAraM prAvaraNaM guru। akAlajAgarasvapnaM kaThinotkaTakAsanam॥44॥
hk transliteration by Sanscript