Excellent choice — #6 of 31 Viscose ranks #6 of 31 fabrics for night sweats. It is one of the best fabrics for this. Ranked on breathability and moisture absorption, penalised for warmth and weight. The top pick is Linen.
Viscose measures 70/100 for breathability, 13% moisture regain, 25/100 warmth, at 150 gsm. For night sweats, high breathability and strong moisture absorption decide comfort — and its low warmth avoids trapping heat against the skin.