Evening splints. Night splints are equipment worn whilst sleeping that extend the plantar fascia. This prevents the plantar fascia from tightening overnight, cutting down early morning pain and stiffness. This can be a bone spur from arthritis. Additionally, it may be a Haglund's deformity a result of sporting unwell-fitting shoes. https://specialistsphere.com/foot-and-ankle-pain-explained-common-conditions-diagnosis-and-effective-treatments/